Supplier: Jiaou Doll
Jiaou Doll are a 1/6 scale action figure company based in China. They have their own website but lots of other sites and ebay sellers stock their products - mostly bodies and clothing.
The Boss Chair was released in 2018 and comes in black, brown and red. Later they added white and and off-white with a black frame for a modern look. You can pick them up for around £25 and they look awesome. They even kind of settle a bit when you put a doll in them, like a real chair does!